Roland Seitre / Bald head uakari monkey (Cacajao calvus rubicundus) captive, occurs in Amazonian Peru, and Brazil.

Mark Bowler / Dusky titi monkey {Callicebus moloch} feeding on rainforest fruits, Yavari River, Amazon, Peru

Mark Bowler / Peruvian red uakari monkey (Cacajao calvus ucayalii) feeding in rainforest on aguaje palm fruits (Mauritia flexuosa) Yavari River, Peru, wild, vulnerable species

Claus Meyer / Red Uakari (Cacajao rubicundus) male feeding on fruit, Amazon ecosystem, Brazil

Ernie Janes / Coppery titi monkey (Callicebus cupreus) and baby. Captive. Digitally added leaf pattern.

Ernie Janes / White-faced saki (Pithecia pithecia) portrait. Captive, occurs in n Brazil, French Guiana, Guiana, Suriname and Venezuela.

Oscar Dewhurst / Dusky Titi monkey (Callicebus moloch) family troop sitting on a fallen tree in the Peruvian Amazon, with one grooming another. Madre de Dios, Peru. March

Oscar Dewhurst / Dusky Titi monkey (Callicebus moloch) family troop sitting on a fallen tree in the Peruvian Amazon, with one grooming another. Madre de Dios, Peru. March

Oscar Dewhurst / Dusky Titi monkey (Callicebus moloch) two on branch of dead tree in the Peruvian Amazon. Madre de Dios, Peru. March. Cropped

Oscar Dewhurst / Dusky Titi (Callicebus moloch) on tree branch in the Peruvian Amazon. Madre de Dios, Peru. March

Ernie Janes / Coppery titi monkey (Callicebus cupreus) portrait, captive, occurs in South America. with digitally added leaves.